html,
body,
h3,
ul {
  margin: 0;
  padding: 0;
  height: 100%;
  list-style: none;
}
.box {
  width: 249px;
  height: 260px;
  padding: 10px;
  border: 1px solid gray;
  margin: 0 auto;
}
.box .nav-header {
  font-size: 15px;
}
.box .content ul {
  margin-top: 10px;
}
.box .content ul li {
  margin-bottom: 5px;
  border-bottom: 1px dashed #000;
}
.box .content ul li a {
  font-size: 14px;
  text-decoration: none;
  color: #000;
}
.box .content ul li a:hover {
  color: red;
}
